sasgen



jUhr 19;. '9999; A, M. SASGEN 9 2,379,992

` WORK SUPPORTING AND FINISHING APPARATUS 'Filed July 9, 1945 5 sheets-sheet 1 94 Y Y d* 0 i1 107 Il ish29 y July 10, 1945. A. M. sAsGEN WORK SUPPORTING AND FINISHING APPARATUS Filed July 9, 1943 3 Sheets-Sheet 2 www? July M, 1945. A. M. SASSI-:N

WORK SUPPORTING AND FINISHING APPARATUS 3 Shams-Sheet Patented July 10, `19.45 l

poration of Illinois `formed `work` blankyandfmoreparticularly to an Es rA'llilirwww @2,375,992'1" 12]" WoRKsUrroRTlNGiAND FINISHING l s Aremus-'rUsy l r i Anthony Mr S'asgern', Chicago, Iill.,

i` Grand Specialties Coin apparatus Afor supporting Aand` finishing ar-.C- i

l shaped workrblank such a'sthe1 body member; of a -r G-'-olamp. i

c-clarnp, as `the `namesuggests,` has` a C-ishaped frame or body member whicnaffords twdarms projecting from opposite enidsrofa; cross mem- `4 bemand one: oftheserarmsfrhas a pad on its-inner surfacefor engagementrwith one surface of the l Workcto `loeclar-nped. "Alhetotherrarm `of` the C- shaped body hasha clamping. screw threaded `therethrough so that aiclamping foot carried on `the inner end of th'e screw` may be tightened to- `wizardthe inner face l ofthe first mentioned arrn and against `an oppositely facing surface of the WorkWh-ich is to be clamped. l The C-shaped body ofrrsuch a clamp is usually` formed as a casting, whicn thereafter has one armthereof drilled-"and tapped to receive the ,clamping screw, anduhas the other arm machined to provide a flat claxnpingsurface on the` padat right angles to` theaxis of the screw, Thisat-.surfaoe must beltrulyat right angles `to the axis` ofthe clamping screw, "fr l and the .attainment ofthisrelationship has in th'e pastentailed theperformance of a plurality' of machining operations `vvhcl-lwere. ldifficult `topoordinate, insuch "a manner as to attain-this desired relationship between rtJce` clamping surface and "the clamping screw; and this has requiredran a 5x N V2,319,992

"assigner" to accompanying drawings which; icyl way of l illus.-

til1""50n,"show a preferred embodimentnand-.mhe i i pfmeipl thereof: andi what now consider foto l l the best mode in Whicnrhave coni-,ommaedyap out'departingrtrompthe presentrinventionfandlthe torso `partiallyirr front elevation ond partiallyirr section and showing an apparatus embodying-r the fetures of this invention. l

. i' Fig. 2 is atransverse sectional ,View takenjalong `the 1ine2--2 oiFgQl;

Figf. `3 is atransverse` sectionallviewtaken along ,the1ine3f3'ofFig 1;.k

F1g.lrisa fragmentary View partially in val.-

"tion `and partially in. vertical section and-showing their parts of` the `apparatusfshinrn intheupper portion of Figi;n Fig.` 5 is 21j:top fplar;pp` p V apparatus shown in tile lower portionolf Fig`. `1; f Fig. disfalflorizontal secti'onaliviwtall'en along parts of the apparatus employed asasn'ownwm Fig.

excessive amount oiltinle and has resulted'in the production of an` `excessivetnuinloer ofl defective clamps.

it `is an. object i of trlisfiriverrtion, therefore,` to` Afacilitate the manufacture of Cclamps,. and particuarl'ynto facilitate the machine operationsre- (l'd th'l, ad albjet'rrelated t0 the foregoingl's to enable `dulclrsurd accurate positioning of therCjiafr'ip bo'd'f' member for each of the 11.

niacnrnesoperationsgto `ne zperformed thereon.

Still ncth oli of the invention is t0 acoperations Witl'rlout single positioning or mountmay `los ,shifted-into position and may be driven thE "drllll `op'eratiillgr neansto mill the desired flat surface on t pad `i"`the `other arm.

` further' okl'ets of tnefpjresent irrveriiion losriparon` orriil'refollowirrg'descripti'on and olsirris and: are illustrated in l'the and U televsiionslrvisw illustratingtlrs irri-s1 ihres ingesamt-ron;

` W' For `purposes"-`ofdiscl'osref the inventionis shown in the drawings and `will be describeclihere- 1 inafter as en'llbi'ldi'ed `in awork 'blankvsupporting and i'lnishirg apparatus" [2r which is particularly adapted for usupportig and Aiiriishing a f-shaped l body inembeiffsuch `ias that-used fin' adi-clamp. For a' moreV readyunderstanding of"` the` invention, such as: Cshapedlbodyzmemberi5 is shown in the drawings in its" operative supported orilrxnounted` position intheapparatus rIL` The`bod-y#member` l `having'iarnintermediate'` portion-or backl IEyoand la.

the` arm I 'I` is formadas-best shown inFi-gsj. Irland i 5, with an enlarged `cylindrical i head `I il adapted to `loe-drilled,and Atlflreadedl,internally itoylreoelive the conventionalftighteningSor pressure applying `The-lower arm 30 b `hasa plate `4I) secured thereto and cooperating its' free end and on the side facing the head I 9, as

. ed with a transversely disposed flange 2| which imparts a generally T-shaped cross section to the body member I2, as clearly seen in Fig. 6. Thus the intermediate portion I6 as well as the arms I1 and I8 may be said to include a flange and a reinforcing rib,V and as shown in Figs. l and 6, the ribs of the three elements of the body member I2 are integral and continuous. This rib portion varies in its outward extent from its point of joinder with the associated flange 2 I, and this/result's, `as shown in Figs. 1 and 7, in th'e formation of high points 22l and 23 at the juncture of the intermediate portion I6 and the arms I'I and I8. Completion of the 'cast body member I5 requires Adrilling of thecylindrial head I9 to form a bore I9 ofthe proper size, Fig. 5,*tapp'ing of the bore I,9 'to form internal threads inthe bore, and millpad v2l) to give the same a smooth, finished "and plane lsurface .20' strictly at right angles to the axis of the bore ISIy .in the cylindrical head I9; and the accomplishment of'these operations Vin a more *expeditiousl and .vetA precise manner Vsja feature of this invention. To this end, the appara/tus` IN2J comprises a combination work hold'erand tool supporting means and a driving means for the various tools employed in the different'operations.v `The oombinationwork holder and tool Vsupporting means 'comprises a .rectangu- 'larbas'e'25 adapted t`o be secured as by bolts .26 v

4tothe.bed 2l, of `a suitable machine such as a c drillfp'rfess. Atithe front ofthe base 25, as viewed ."irfFig. f1. is a` work blank holder which is parfticularly designed for the reception of the C-clamp body` member I5. This holder'iricludes` an upstanding `side wallmember 28 cast'integrally with `tl'rerbase 25a-nd the member 23 is, in itself, generally C-shaped so as toA afford an intermediate iJortiori-or back 29, a lower arm 30, and an upper arm Figs.- rand 5. ,The wall member `2a is vvdisposed parallel with the front edge of tbe-base L and is bracedin'a frontr to rear direction bv iaurearwardly, extending rib 32,1while the upper arm` 3I is braced by a horizontally disposed web 33. Atits end.. the lowerjarm 30 has a forwardlv oroiecting `extension' 34nrovided with a lip extending toward the main-portion, that is, to-

lwardthe left as lviewed in Figs. al and 6. The

lip forms a support upon whichthe end portion of the arm"|8 ofthe body member I5 may apparent.

-of the side wall member 28 :therewithto forma pocket into which the lower ",armIS'ahd a part'of the intermediate portion I3 off'thebody member `I5 mayV quickly be dropped. F

nd `thisplate 40 has a finger-like extension 4I hich `is disposed generally parallel. to' the'lower "fa'rm 3'J'b'utl in spaced relation thereto so as to Vvdesired platef4|l Ais preferably secured 'in position by a plurality of bolts 42.

work receiving pocket. The

One of the 'bolts142 Iis wardly from the extreme left of the member 28` and, in addition to receiving one of the bolts 42,

provides a guide surface against which the back portion I6 of the body member I5 may initially rest. A second such lug 46, having a similar guide surface 41, projects from the portion 28 somewhat above the lug 44. The upper, inner corner 48 of the plate 40 is preferably bent outwardly so as to facilitate the guiding of the body member I5 into the pocket.

fThe upper arm 3| of the member 28 is, like the arm 30, formed at its end with a forwardly lprojecting, extension 50, and secured to the front face of the extension,` as by bolts 5I, is ja small plate 52'. The plate 52 extends to the left beyond the extension 5u to form a socket'for the reception of the cylindrical head I9 of a'C-clamp body 'member I5.

` To aid further in the correct, accurate and rapid positioning of a C-clamp body member I5 in the holder, the upper arm 3I is, over a lportion of its length, formed with a slight inwardjbulge 53, disposed so as to be approximately opposite the ilang'e 2l of the upper arm'll of a C-'clamp body'member mounted in the holder.' The lower `arm 30 ofthe member 28 is also madewide enough to lie closelyl adjacent the flange 2l ofthe lower arm I 8 of a body member, and is cutaway at 54, Fig. 6', to accommodate the pad 2l).v Positioned just to the' right of the lugs 44 and 46 is a vertical, rib 56 which projects forwardlyjbeyond either the bulge 5?v lor the forward face ofthe ing of the pocket.

lowerarm 30 so as to cooperate with the plate 40 ,to rform aguidevchannel for the narrow, rectanlgular'portion I6 of the. C-clamp body member.

It i'sbelieved apparent from the foregoing that a C-clamp body member I5 'may be quickly insertedv into a] vertical position in the holder simply bymoving the body member downwardly into the holder with the arm VI8 at the bottom. Since thepad 2li is too large to pass through the socket-formed by the plate 52 and the upper arm 3I of the holder, a body member I5 kto be y inserted in theV holder is brought to a position lparallel with the member 28,k with the arm I8 just high enough to clear the plate 40 and with the arm I'I disposed above the arm 3l of the holder. In this way the pad 20 need not pass through the socket formed'by the plate 52 and the arm 3|, and at the same time the vdistance that the body member I5 travels is cut in half so as toreducethe time of insertion. This starting position also facilitates'the entry of the arm I8 into the pocket formed between the plate 40 and the .member 28, .for the workman can," with the aid of the bent corner 48, easily strike the open- The body member I5 is then permitted to drop and is guided by the lugs 44 and 46, the rib 55, and thearms 30 and 3| so that it moves into substantially the position shown in Fig. 1, and this takes place quickly and Without'precise adjustment or manipulation. In this position the body member I5 is supported by the lip 35 and the boss 43, the boss 43v being engaged Vcaracas byV the rounded cornerllof the body member I5 which serves to` cam the bodyimam-bern to` the right to the limit byengagement of the pad 20 with the shoulder T36. The body member l5 is guided "in a fron-t to rear direction by the rib 56 and bythe" upper socket and pocket formed, respectively, i byl the upperuarm and the lower arm of the member 28 and attached parts, and is 'guided and located in a right to left direction bythe extensionsy 34 and 5'0- onfthe arms of the holder and bythe lugs M `and 46".

. While the body member I"5 is thus `quite -rmly 'and accurately heldin position, the holderi's preferably provided with means'for clam-ping thebody member in the holder.V -A rst such `clam-ping means serves yieldably to retain the body membery in the holder, and forv thisv purposel a clampholder` by means including a pivot bolt 51 which servesasfa rertical pivotal `axisfor the clamping bar 58'. The clam-ping`bar'158v is urged downwardly by a compression'-spring`` `59 disposed about adapted toldrivingly engage complementaryteeth ingbar 58 isrmountedon the upper arm v3l of the the bolt 5l' and acting between the bar 558 and` a washer G to press the clamping barV toward a horizontal position.

The clampingy bar 58 ist.

adaptedto beswunglover-the upper arm l1 of the l body member l until it comes torest in `engagementwith the high spot 22, and inasmuchas the body member i5 is rounded or inclined downwardly away from thehighf spot 22', a comparatively strong springlf may be employed, forthe i rounded or slopingflsurfaces immediately adja cent 'the high spot 2*/2' function `as cam surfaces, and Ahence" the `attendant 4needs merely to apply the ne-cessaryfforceto swing the clamping bar 5t from an inoperative position, `parallel tothe arm al', to its operative position,- shown in Figs.

l, 5, 7 and 10." .WV l

Additional clamping ;means `are provided for assuring accurate positioning `of `the `body member in a horizontal direction with respect to the holder, and to` this endlthemember 2'8, intermediate the lugs and 4B', isformed with a boss 65 having a horizontal threaded bore to receive a clampingscrew 6b.` The screw G6 is arranged to bear at its' inner endfagainst the back' llcf the handle 6l, `the clamping screwli may be operated to force the entire body member E to the right to the limit of movement determined by engage- `ment of the pad 2.0 withthe shoulder 36l and eneasement of the cylindricalhead |19 with theextension 50. The `bod-y member will thus be posit tioned as shownfin Figs. l, 5` and 7-. l

This position in which the @clamp` body mem-7 ber l5 is thus located is such that it serves as the position-pf the body member for all of the `machining operations; to l be performed thereon.

These. operations` asl above stated, include drilling the bore I9 in the-cylindrical? head I9, forming an internal' thread inthe bore i9', andnish-i-ng the face Ztl" of `the pad 2l)` so that this face is smooth and disposed at right` angles to the axis of the `bore 819". To drive all of the tools required in the nishing operations; andto support some of the tools, a driving means 68, Figs. l and 4, is provided. `This driving means, for the purpose of expediting the iinishing operations, includes an automatically disengageableclutch. To thaterld,

the driving mea-ns 6B' is composed of' a driving part F 69 and adlriven partr'lil. The drivi-,ngipart 69 is in the form of an varbor having a conventional, taperedwshank 'Il and a cylindrical portion 12 `forming anl upwardly facing anrrularshoulder 13. The tapered shank-ll is adapted to be linserted in body member f5' and vby-means of `a transverse formed on. lthe upper` end ofthe cylindrical driven member "lll, The member` 'Hl has ab sleeve 'i9 securedthereto, as'byscrews IT8, and this sleeve 'l-S slizdably surrounds the cylindrical portionclZ m `has an inturned annular `liange 80,l `which loosely surrounds the .tapered` portion `lll so as `to `permit of limited longitudinaisnor/'ement of the driving and driyerrpartssrelative to one another.

Ball bearingslt arefvdispo-sedabout the tapered `portion 'il and .onlvtnel shoulder l3- so` asvtobe held in: place` by the sleexzelf, and these bearings serve at certain times to. support. the sleeve 19;

The `driving and driven partsare, asbestl seenin Fig. 1,. normallyurgedt-.apartaby-a compression spring 8c2. `To.accomuzriozd'atethespring, eachpart has an.axialfrecessflformedictherein' toreceive i bearingballsill .as wellastthe ends. of thezzspring 82. The springfr? strongenough to disengage the parts: but `whenthe spind'leflll: isforcedunrfed downwardlyzduringithe actualdrilling, tapping or milling operations; the spring lis. compressed `and the clutch is engaged.r sowas to rotatetheudriven The lower or outernzend liaceof the memberlll is formed with a square` recess 85.5 to` receivessquared tool retainer 8E which held incplacei in `the rei `cess by meansrsuchas a-pairwof set screws Bil. The tool retainerfl ihas ausquare opening or` socket'l B 8 formed Itherein `tor `the. `reception `of the squaredsend 89` of the' shank of` a tool', suchy as a `drillull", showninFig. 1,01- aLtap 9i, shownin Fig. l0. The tool retainer fcafrries the conven-` tional spring pressed ball detent 192 forrengaging `the surface of the: squaredwshank of thetool; for

the purpose ,of yie'ldably holding the `tool `invthe retainer. t t

For the drilling' of a bore t9' ,in thecylindrical enlargement t9; a. dril'lffilllA is inserted in the driving means', as "showninxFig.,l l, while, for forming an` internal threadwithin therbo're, a tap 9| `is substituted forthezdrill, asshown inFig. `10. `In

both operations-,the tool is both driven andzsupported by theydrn/ing means 6B., andboth operations are `performedlupon. the same part` of` the frame member l5, `t-husreadly making` possible the `performance' of `both operationsxwith `the body memberheld one ad .the same position. The remaining operation,` namely, the finishing of thelpad; 2,0, has inthe past required `a change in the position of the body member t5., and hence the same positionfwhioh it `or tapping operations or required the expenditure of much time `and effort in. readfjusting the :body member so `as to` obtain a pad 29.1 withits. iinlished surface at disposed at Iri'ght angles to the center line of the bore I9' in the` cylindrical headl In .accordance with thisIi-nveritilon provision is A '.madeuwhereby thewpad 2.0 `mayfailso be inisheclv t while kthefbo'dy member {l5} remains `in o-ne and occupies durin-gtloe` drilling and tapping operations; To that end, thel combination work `lolanl; and toolisupporting means includes a tool support 91B` which4 carries a milling .cutter 954, and the tool support B4 is so `mounted as to "afford anv inoperative position wherein it Idoes not interfere `with `the drilling `the insertion of i a body member into-thewholder, and an operative posiv base 25. The millingcutter 95 is carried on the lower end of a shaft |03 which is supported for longitudinal as well as rotational movement in the bearing block 95. To that end, the shaft |03 is supported inbearings |014 positioned in a cylindrical recess |95 in the bearing block 90. Carried on the endof the shaft |93 opposite the cutter 95 is a collar |06, and a spring |98 surrounds the shaft |03 between the collar |06 and a washer I'I which rests on the upper one of the bearings |09. The spring |98 is of such a strength as to overcome the'weight of the cutter 95 and thus normally hold the same in. the elevated or withdrawn position shown in Fig. 1. Theupper end of the shaft |03 is formed with a squared recess or socket |09 to receive a driving shaft, as will presently be disclosed.

When the milling cutter 95 is not in use it is. disposed in the out of the way position `shown in Figs. 1 and 5, and when a milling operation is to 'be performed, the tool carrier or support 99 is swung to the active position, shown in full lines in Fig. 7 and in dotted outline in Fig, 5. It will be observed in `this connection that the height or overall length of the cutter A95 and its shaft ID3 is such that the tool and the tool carrier will clear the adjacent surfaces of the work holder as well-as thesurfaces of the work. Thus the milling cutter is located over the pad 20, and to retain the milling cutter 95 accurately in this position over the pad 20, means are provided for locking the tool carrier 94 in that position. For this purpose the block 96 has a vertically disposed tube IIZ secured on the side thereof which is most remote from the pivot 99. Likewise secured to each finger 4| and to the plate 52 are similar, vertically disposed tubes II3 and IM, respectively. The tubes ||3 and II4 are in axial alignment and, when the milling cutter is in proper position Vover the pad 20 of a C-clamp body member I 5 mounted in the holder, the tube I IZ is disposed between and `in axial alignment with the tubes I I3 `and H4. When in such alignment a locking pin ||5, see Fig. 9, having a hand grip IIB, may be passed through all three tubular members, to thereby retain the tool carrier 94 in 4its operative position. The pin II5 is, of course, proportioned to have a sliding t within the tubes IIZ, |I3 and |I4.

When the milling cutter 95 is thus held in its operative position, the squared recess or socket |99 of the shaft |03 is disposed in axial alignment with the bore I9 that has previously been drilled in the cylindrical head I9. The milling cutter 95 may, therefore, be driven from the tool spindle 'III through the medium of an extension shaft Ill, shown in Fig. 8, passing through the bore |9'.in the head I9. This shaft ||1ihas a squared end I I8 adapted to be received in the opening or socket 98 formed in the tool retainer 86 in place of the squared shank of a drill or a tap, and has a squared end H9 to non-rotatably engage in the squared recess or socket |09 in the shaft of the milling cutter.

In the use of the apparatus of this invention, the clamping bar 58 is swung parallel with the arm 3|, the clamping screw 6 6 will be released,

the milling cutter 95 is disposed in its inoperative position shown in Figs. 1 and 45, and the tool driving means 98 will be in a somewhat higher position relative to the work blank holder than that shown in Fig. 1. It will be assumed also that the spindle 'I4 of the machine is already rotating and that a `drill has been inserted in the driving means 98.

The operator now grasps an unnished C- clamp body member I5, usually and preferably somewhere near the juncture of the arm I'I and the back I6, and places the body member parallel with and against the member 28, with the arm I8 intermediate the arms 30 and 3l of the member 28, and then releases the body member to ,permit it to drop into the pocket formed by the member 28 and the plate 40. This positioning of the C-clamp body member in the holder is customarily performed by the left hand, leaving the right hand free to swing the bar 58 from its inoperative position parallel to the arm 3| to its retaining or clamping position at right angles to the plane of the body memberv and the member 28, as shownin Figs. 1 and 5. The body member I5 is now securely clampedv in the holder and 'is substantiallyfin nal and precise position because of the cam action of the boss d3 on the rounded corner of the body member, and the small clearances which'are afforded between the body member and the pocket. While the operator, with his right hand, is swinging the bar 58 into position, the left hand may be employed to give the hand screw 66 a few turns, thereby completing the precise positioning of the body member in the holder, and attaining a tight clamping of the body member I5 in the holder.

The spindle 'I4 is now lowered, causing the drill 90 to contact the cylindrical head I9. This contact ofthe drill with the head I9 'overcomes the spring 82 and forces the driven part 'I9 of the driving means 68 upwardly relative to the driving part to cause engagementof the clutch thereof.

Further resistance of the cylindricalhead I9 to penetration thereof by the drill 90-wil1, of course, maintain the clutch engaged until the drilling of the head is completed, whereupon the spring 82 will serve to disengage the jaws 'I5 and I6 so that the driven part 1.0 will come to rest, or at least be rotated only by the very slight frictional force transmitted through the ball bearings 8|. The aforesaid boring operationv is preferably in the nature of a finishing operation, a rough bore being formed in most instances in the course of the casting operation `or by a previously performed rough boring operation.

The operator then causes the spindle 'I4 to be elevated, and Without the necessity of stopping rotation of the spindle may grasp the drill 90, withdraw it from the tool retainer 85, and insert the extension shaft II'I. As above stated, this may all be done without arresting rotation of the spindle 'I4 and yet may be done with complete safety to the operator, because of the automatically disengageable clutch incorporated in the driving means 68. Next the operator swings the milling cutter into po-sition over'the pad 29, and locks the same in that position by inserting the pin I|5 through the tubes |I2, ||3 and IM which are now in axial alignment. The spindle I4 is then lowered or fed downwardly so that the extension shaft II'I passes through the bore I9 just drilled in the cylindrical head I9 and into engagement with the squared recess or socket |09 in the shaft |03 of the milling cutter. Continued downward movement of the spindlewll compresses lthespring |08 `to cause` the cutter 95 to engage the surface of the pad 20,` and the reaction then causes the spring 82 of the .driving` means 68 to be overcome, thereby causingjen@ gagement of the clutch jaws 'l5 and 'I6 ant drive ofthe milling cutter.

After the milling operation has been and result-` e [thebore inone arm` ofabody member;` a tool" support, `a rotary` face milling tool mounted on lsaidltool support for` axial movement from a nor-.-

mal retractedy position e to an advanced; operative position for `milling the fiat surface on` the other armgof a body member, said support beingpvot.-` y ally mounted in conjunction with said holderandw performed,` thel spindle is again raised, which will disengage l the extension shaft Il] from the milling cutter..` and withdraw it from the bore `Ill inthe cylinf drical head I9. t The operator then removesthe e pin I l5, swings the milling cutter to its inoperative position,`removes the extension shaft lill` from `the tool retainer, and mounts the tap 9i inthe tool retainer. The spindle is then lowered to perform the thread cuttingoperatiom the driv` ing clutclrbeing` closed in this instance inthe same manner as in the'previouslyk described op` erations. When the tapping operation has been completed,` the tap 9| is`removed,the drillg-90 againinserted, and the finished body member` |5 e is removed from the holder, leaving the apparatus ready to repeat the operation on another uni nished-clamp body member.

It is believedl apparent from the above "descrip-r tionthat the manufacture of (ez-clamps is hereby greatly expedited because of the increasedfacility with which the machining operations may bezper.-

formed. `Not only is the unnishedC-.clampbody e member quickly; and accurately positionedirfor each of the operationsto be performedgthereon,

but `those operations have been made Vpossible with but asingle positioning ormounting of the i C-clamp body member.` `This not only `reduces the time required to perforrmthe operations but assures an improved productbecause all possi-I bility of error inthe positioning of the body member for the different yet related operationsflis eliminated.

and modification and I therefore do not wish to be limited to` the precise details; set forthgbut desire tolavail myself of suchchanges and` alteraf e tions as fall within` the purview of thefollowing urging saidcutting tool to a withdrawn position,

saidauxiliary support having an inoperative posi` tion and an operative positionwhereinthe rotary cutting tool carried thereby is in' position when shifted axially to act on awork blankin the holder while the work blankremains in the same position had during the performance of the other operation'` thereon, and means interchangeable with the tool` carried by said tool .supportingv and driving means and forming a connection there from to the tool in said'auxiliary supportfolro.` tatively driving said tool in sadauxiliary sup--` port and for shifting the same faxiallyinto' cooperativeA engagement with thelwork blank;

n n n 4( e Hence, while I have illustrated and described the preferredembodiment of my inventiomritis tombe understood `that it is capable of variation ber, [ag holder for supporting abody member in a iixedA and predeterminedposition, driving means operable to `support and drive` atool for drilling l being; swingable from an inoperative position` wherein the rotary tool is in an out-.ofLthe-way position` to an operative positionwherein the 'roe taryF tool is positioned between the armsfoffra body member mounted in said holder, and means e "insertable in said tool drivingtmans ingplace of, a tool so as to extendthrough the bore in saidl` e one-arm of a `body member mountedinwsald f holder and ,drivingly engage and thereby,drive` saidmilling cutter `and advance the same to :its

operative position. l

`3.111 an apparatus for performing operations e on a C-clamp body memberincluding.drilling;a bore in one arm ofthe body memberand milling afflat surface on the other arm ofthebody meme. bena holder for supporting; a body memberin Aa,L

xed and predetermined positiorn driving 1means/1 operable to support `atool Afordrilling the'borep u in jene arm of the body member, a tool;support@` for` axial `movement from anormaltretractedposia` tionwto `an advanced` Working position, a rotary tool journaled in `said tool supportandhajving a sha-ftywitharecessformed" in one end thereof;y

f said, tool support beingpivotally mounted in oo n-` junction with said` holder' and having `an inoperaf;`

tive;` position wherein the rotarywtool carried thereby is in an out-of-the-way positionand anoperative positionywherein the erotaryrcutter; is;

located between,` the; arms of a body member, mounted in said.` holder with the cutter directed,

vtoperformits finishingoperation` and` the rea-4` cessed end of the cutter shaft` directedl toward:

and in axial` alignment with the, bore formed i in` the .one` arm of the body membenand `means `insertable in the driving means and adapted to pass through the `bore in the onelarmqof the body member and intol driving `engagement with .the

recessed shaft of thewrotary` cutter torotate said cutter and advancethe same axially to its` ad.. vancedworking position.` l e `ign u 4. In a-workblank finishingappar'atus, a supporting `means comprising e abase and -a work blankholdermountedton said base; a rotaryand` axially movable "tool smiporting` andy `driving means positioned jto haveya tool supported and driven` thereby operate upoizul a work blank mounted in said holder, said tool `driving means includinga normally.` disengaged clutchengageable by .the reaction resulting from `operative contactpof a tool driven bysaidydriving means l withia work blank,` an auxiliary tool-:support piv-` o,tally mounted on said basefa rotary; cutting` ltool mountedl infsaidauxiliary support forgrota-` tionV and for limited axial movement, springimeans urging said cutting tool to; a withdrawn position,` said auxiliary support having an` inoperative `posi-` tion and an operative positionwherein `therotary '2. In an apparatus forperforming operationsA on anca-clamp body member including dri-lling?,` 7

cutting tool carried `thereby is in positionwhen shiftedaxially-toact on a lwork `blank the holder while thework blank remains `the:` same position` had duringthe performance of-theiother l operation thereon,` and means interchangeable e with `the tool carriedby said` tool supporting and,

. 5f borein one arm of `the body member andmillingj l a fiat surface on theother arm of the bodymemfr .i

driving means and forming a driving connection therefrom to the tool in said auxiliary support.

5. In an apparatus for performingmachining operations on a C-clamp body member, a holder for supporting a C-clamp body member in a fixed and predetermined position, a tool support pivotally mounted in conjunction with said holder, a milling cutter mounted in said support for rotational and limited axial movement, a spring tending to withdraw said cutter axially from a cutting position, said support being swingable from an inoperative out-of-the-way position to an operative position wherein the milling cutter carried 'thereby is in position to act on a particular 'surface of a C-clamp body member in said holder, a rotary and axially movable tool driving means including means for releasably retaining a tool and a normally disengaged clutch engageable by the reaction resulting from operative Contact of a tool driven by said driving means with the C`clamp body member, and means insertable in the tool retaining means and operable upon axial movement of said driving means to engage and drive the milling cutte when in operative position.

`6. In a nishing apparatus for a C-clamp body member, a holder for supporting a body member in uprightposition comprising a base, means on the base forming a pocket for the reception of one arm of a C-clamp body member including abutment means adapted to be engaged by the free end of the arm received inthe pocket, means forming a socket for the reception of a portion of theremaining arm of a body memberv mounted inf the holder and including abutment means adapted to be engaged by the free end of the last mentioned arm of the body member, both said pocket and said socket opening upwardly to permit mounting of a body member in the holder by simple vertical movement, means for latching a body member in the holder against vertical Withdrawal therefrom, and means operable to force vsuch a body member against said abutment means to accurately position and clamp the body member-in a predetermined position in the holder.

' 17-. -In a finishing apparatus for a C-clamp body member a holder for a body member comprising a` base, a C-shaped member upstanding from said with said lower arm extension and said lug to form an upwardly opening pocket for the recepber-in spaced relation thereto and cooperating i tionof one arm of a c-clamp body member, a

plate'secured to the extension on the upper arm of said member and extending parallel with the arm to form an upwardly opening socket for the reception of the end of the other arm of a c" clamp body member mounted in the holder, and

aretaining bar mounted at the top of said member and swingable to overlie'a C-clamp body member mounted in the holder to maintain the cross section, said finishing apparatus comprising a holderrfo'r such a body member having a base, a 'C-shaped memberupstanding from said base and having a lower arm, an upper arm and 'an' intermediate interconnecting portion, an extensionE on the upper arm projecting laterally of the plane of the member and an extension on the lower arm projecting in the same direction laterally ofthe plane ofthe member, a lug projecting from the interconnecting portion of said member intermediate the upper and lower arms `and-in the same direction laterally as said extensions, a plate having a finger-like extension se cured to'said memberwith the finger-like ex tension parallel with the lower arm, said plate togethervwith said lower arm extension and said lug forming an upwardly opening pocket for the receptionof one arm of a C-clamp body member with said plate so arranged as to engage sur-- faces of the reinforcing rib of a body member mounted in the holder, a vertically disposed positioning rib on the interconnecting portion of said upst'anding'memb'er projecting toward said plate to form therewith a Vertical guide passage for the reception of the reinforcing rib of the back of a C-clamp body member, a plate secured to the extension on the upperarm of said up`` standing member and extending parallel with the' and which has a pad on the other arm to be milled, said apparatus comprising a base, a C- shaped wall'me'mber upstanding from said base having a lower arm, an upper arm, and an intermediate interconnecting portion, an extension. on the upper arm projecting laterally of the plane of the member and an extension on the lower arm projecting in the same direction laterally of the plane of the member, said last named extension including a lip-like projection parallel with the lower arm for engaging and supporting one arm of a C-clamp body member andmerging with said extension short of the upper edge thereof to form a shoulder, a boss projecting from said member laterally of the plane thereof near said base, a lug projecting from the intermediate portion of ysaid member laterally of the plane of said member in the same direction as said extensions, a plate secured to said member and vcooperatingwith said lower arm extension and said lug to form an upwardly opening pocket for the reception of the pad-carrying arm of a C-clamp body` member, said lip-like Vprojection and said boss supporting a C-clamp body member with an edge of its pad abutting said shoulder on said lower arm extension, a plate secured to the extension on said upper arm and extending parallel therewithto form an upwardly opening socket for the reception ofthe cylindrical head of a C-clamp'body member, a retaining member mounted at the top of said member and shiftable to overlie a C-clamp body member mounted in the holder to retain the body member in the holder, and a clamping screw mounted in said upstanding wall member and operable to abut a body member mounted in the holder at its intermediate portion to force the arms of a body member tightly against the lateral extensions on the arms of said upstanding `wall member to thereby accurately locate such a body member in said holder. l

10. In an apparatus for nishing the pad on onearm of a C-clamp bodymembena holder for supporting a body member in upright position and with the pad-carrying arm lowermost, said holder comprising a base, means on the base forming a pocket for the reception` of the padcarrying arm of a C-clamp body member including limit means adapted to be engaged by the outermost edge of the pad, means forming asocket for the reception of a portion of the remaining arm of a body member mounted in the holder and including limit means adapted to be engaged by the free end of the last mentioned arm of the body member, both `said pocket and said socket opening upwardly to enable mounting of a body member in the holder by simple down- Vwardmovement, means for latching a body member in the holder against Vertical withdrawal therefrom, means for accurately positioning and clamping the body member in the holder by forcing the same against said limit means, a millingr cutter, a support `for said 'cutter pvotally mounted on said base, saidsupport having a normal inoperative position and an operative position wherein the milling cutter is positioned over the pad on a C-clampbody member in said holder, and means for locking the support in operative position.

11. In an apparatus for boring one arm of a C-clamp body member and for milling a flat surface on the other arm at right angles to the axis of the bore formed in the first mentioned arm, a combination body member and tool supporting means comprising abody member holder for stationarily supporting a O-clamp body member and a shiftable tool support, ka milling cutter `journaled for limited axial advancing movement in said tool support and Ahaving a shaft with a re,- cess formed in the` end thereof for the reception of a driving member, said tool support having a normal inoperative `position and being shiftable face on the other arm at right angles to the axis ofthe bore formed in the rst mentioned arm,` a combination body member and tool supporting means comprising a `body member holder for stai tionarily supporting a C-clamp body member and a shiftable tool support, av milling cutter journaled in said tool support for rotational and limited axial movement and having a shaft with. airecess `formed in the end thereof for the reception of a driving member, a spring surrounding said shaft and urging said cutter to a withdrawn position,

A said` tool support having anormal out-of`the- Way inoperative `position and being shiftable to an operative position wherein the milling cutter is positioned between the arms of a body member mounted in .the holder with its cutting face opposite the surface to be milled and'with its shaft in axial alignment with the bore formed in the rst mentioned arm of the body member` i to receive a driving member extended through the bore inthe arm of the body member.`

sAsGEN. 

